Requirements for presidential elections were set by the a. tenth amendment. c. twelfth amendment. b. thirteenth amendment. d. fifteenth amendment.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

i thinl it is the 1st answer